From 2a6db3c351426828450bcbad50f9851144793e55 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 8 Jan 2005 08:08:56 +0000
Subject: [PATCH] Add support for FP->INT conversions and back.

llvm-svn: 19369
---
 llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp |  5 +++
 .../lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 11 +++++
 .../CodeGen/SelectionDAG/SelectionDAGISel.cpp | 43 +++++++++++--------
 3 files changed, 42 insertions(+), 17 deletions(-)

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 4d6d0ebacaed..e42d7f27c387 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -575,6 +575,11 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
   case ISD::TRUNCATE:
   case ISD::FP_EXTEND:
   case ISD::FP_ROUND:
+  case ISD::FP_TO_SINT:
+  case ISD::FP_TO_UINT:
+  case ISD::SINT_TO_FP:
+  case ISD::UINT_TO_FP:
+
     switch (getTypeAction(Node->getOperand(0).getValueType())) {
     case Legal:
       Tmp1 = LegalizeOp(Node->getOperand(0));
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 4ad651718f56..57a66f448b2e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -396,6 +396,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
     case ISD::SIGN_EXTEND: return getConstant(C->getSignExtended(), VT);
     case ISD::ZERO_EXTEND: return getConstant(Val, VT);
     case ISD::TRUNCATE:    return getConstant(Val, VT);
+    case ISD::SINT_TO_FP:  return getConstantFP(C->getSignExtended(), VT);
+    case ISD::UINT_TO_FP:  return getConstantFP(C->getValue(), VT);
     }
   }
 
@@ -404,6 +406,10 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
     case ISD::FP_ROUND:
     case ISD::FP_EXTEND:
       return getConstantFP(C->getValue(), VT);
+    case ISD::FP_TO_SINT:
+      return getConstant((int64_t)C->getValue(), VT);
+    case ISD::FP_TO_UINT:
+      return getConstant((uint64_t)C->getValue(), VT);
     }
 
   unsigned OpOpcode = Operand.Val->getOpcode();
@@ -821,6 +827,11 @@ void SDNode::dump() const {
   case ISD::FP_ROUND:    std::cerr << "fp_round"; break;
   case ISD::FP_EXTEND:   std::cerr << "fp_extend"; break;
 
+  case ISD::SINT_TO_FP:  std::cerr << "sint_to_fp"; break;
+  case ISD::UINT_TO_FP:  std::cerr << "uint_to_fp"; break;
+  case ISD::FP_TO_SINT:  std::cerr << "fp_to_sint"; break;
+  case ISD::FP_TO_UINT:  std::cerr << "fp_to_uint"; break;
+
     // Control flow instructions
   case ISD::BR:      std::cerr << "br"; break;
   case ISD::BRCOND:  std::cerr << "brcond"; break;
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 167d2f7e3594..820a4fb310ab 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -434,24 +434,33 @@ void SelectionDAGLowering::visitCast(User &I) {
 
   if (N.getValueType() == DestTy) {
     setValue(&I, N);  // noop cast.
-    return;
-  } else if (isInteger(SrcTy) && isInteger(DestTy)) {
-    if (DestTy < SrcTy)   // Truncating cast?
-      setValue(&I, DAG.getNode(ISD::TRUNCATE, DestTy, N));
-    else if (I.getOperand(0)->getType()->isSigned())
-      setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestTy, N));
-    else
-      setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestTy, N));
-    return;
-  } else if (isFloatingPoint(SrcTy) && isFloatingPoint(DestTy)) {
-    if (DestTy < SrcTy)   // Rounding cast?
-      setValue(&I, DAG.getNode(ISD::FP_ROUND, DestTy, N));
-    else
-      setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestTy, N));
+  } else if (isInteger(SrcTy)) {
+    if (isInteger(DestTy)) {        // Int -> Int cast
+      if (DestTy < SrcTy)   // Truncating cast?
+        setValue(&I, DAG.getNode(ISD::TRUNCATE, DestTy, N));
+      else if (I.getOperand(0)->getType()->isSigned())
+        setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestTy, N));
+      else
+        setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestTy, N));
+    } else {                        // Int -> FP cast
+      if (I.getOperand(0)->getType()->isSigned())
+        setValue(&I, DAG.getNode(ISD::SINT_TO_FP, DestTy, N));
+      else
+        setValue(&I, DAG.getNode(ISD::UINT_TO_FP, DestTy, N));
+    }
   } else {
-    // F->I or I->F
-    // FIXME: implement integer/fp conversions!
-    assert(0 && "This CAST is not yet implemented!\n");
+    assert(isFloatingPoint(SrcTy) && "Unknown value type!");
+    if (isFloatingPoint(DestTy)) {  // FP -> FP cast
+      if (DestTy < SrcTy)   // Rounding cast?
+        setValue(&I, DAG.getNode(ISD::FP_ROUND, DestTy, N));
+      else
+        setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestTy, N));
+    } else {                        // FP -> Int cast.
+      if (I.getType()->isSigned())
+        setValue(&I, DAG.getNode(ISD::FP_TO_SINT, DestTy, N));
+      else
+        setValue(&I, DAG.getNode(ISD::FP_TO_UINT, DestTy, N));
+    }
   }
 }